Content-based instruction, task-based language teaching, and game-mediated learning are three pedagogical approaches that are perceived as effective in second and foreign language education. These approaches share common ground in a sociocultural and functional view of language learning and popularity as engaging classroom strategies in K-12 contexts. However, challenges may exist in attaining content-integrated language learning goals, designing engaging and efficient language learning tasks, or implementing game-mediated activities in classroom settings. Prior research has suggested an enhanced result in facilitating language learning as well as promoting student participation when combining some of these existing approaches. What is missing is an attempt to blend all three approaches which may lead to a synergistic way of utilizing task-based, game-mediated activities to help achieve the goals of content-integrated language learning. To address this gap in current literature and field practice, I proposed a game-mediated dual learning instructional model that aims to conceptually and practically discuss various ways of blending these aforementioned approaches. In addition, I adopted two analytical frameworks—a close analysis of language-related episodes and a three-step multimodal analysis of learners’ participation—to provide empirical evidence for participants’ language production and multimodal participation during a game-mediated project. This qualitative-driven study took place in a physics class in an independent high school in the northeastern U.S. from January to March 2022. Data sources for the project included (1) audio and video recorded data, and (2) observational data such as student-oriented notes taken during the stay at the research site. The findings of this project illustrate the diverse opportunities for language learning through participating in collaborative, game-mediated, and task-based activities. The findings also suggest that participants adopted multimodal ways of communication when engaging in these activities. This project contributes to the literature on game-mediated second and foreign language education by adopting an interdisciplinary approach to propose a new way of integrating several pedagogical approaches, while also providing an empirical account of this instructional model.